Method for purifying electronic grade sodium metaantimonate with low impurity content

Abstract

This invention relates to the field of inorganic fine chemical material preparation technology, and discloses a method for purifying electronic-grade sodium metaantimonate with low impurity content. The method includes: dissolving antimony trioxide in sodium hydroxide solution and cooling to a first reaction temperature after impurity removal; adding sodium gluconate to construct a coordination metastable system containing a pentavalent antimony precursor; atomizing and dropping hydrogen peroxide to complete the oxidation reaction while maintaining the homogeneous system without precipitation; heating to a second reaction temperature to dissociate the coordination system and induce controlled crystal precipitation; and obtaining the product after separation, washing, and drying. This invention completely decouples the oxidation reaction and crystallization process on the time axis through chemical means, and achieves lattice-level deep self-purification by using a thermally induced dissociation mechanism while suppressing explosive nucleation. The obtained sodium metaantimonate has extremely high purity and a regular cubic crystal morphology.

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